package com.ruoyi.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.constant.GenConstants;
import com.ruoyi.common.core.text.CharsetKit;
import com.ruoyi.common.exception.CustomException;
import com.ruoyi.common.exception.UtilException;
import com.ruoyi.common.utils.SecurityUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.framework.datasource.DynamicDataSourceContextHolder;
import com.ruoyi.generator.domain.GenTable;
import com.ruoyi.generator.domain.GenTableColumn;
import com.ruoyi.generator.domain.ReqGenTable;
import com.ruoyi.generator.mapper.GenTableColumnMapper;
import com.ruoyi.generator.mapper.GenTableMapper;
import com.ruoyi.generator.util.GenUtils;
import com.ruoyi.generator.util.VelocityInitializer;
import com.ruoyi.generator.util.VelocityUtils;
import com.ruoyi.service.IGenTableService;
import com.ruoyi.system.domain.SysSourceConfig;
import com.ruoyi.system.service.ISysSourceConfigService;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.io.IOUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.util.*;
import java.util.stream.Collectors;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * 业务 服务层实现
 *
 * @author ruoyi
 */
@Service
public class GenTableServiceImpl implements IGenTableService
{
    private static final Logger log = LoggerFactory.getLogger(GenTableServiceImpl.class);

    @Autowired
    private GenTableMapper genTableMapper;

    @Autowired
    private GenTableColumnMapper genTableColumnMapper;

    @Autowired
    private ISysSourceConfigService iSysSourceConfigService;



    /**
     * 查询业务信息
     *
     * @param id 业务ID
     * @return 业务信息
     */
    @Override
    public GenTable selectGenTableById(Long id)
    {
        GenTable genTable = genTableMapper.selectGenTableById(id);
        setTableFromOptions(genTable);
        return genTable;
    }

    /**
     * 查询业务列表
     *
     * @param genTable 业务信息
     * @return 业务集合
     */
    @Override
    public List<GenTable> selectGenTableList(GenTable genTable)
    {
        return genTableMapper.selectGenTableList(genTable);
    }

//    /**
//     * 查询据库列表
//     * 查询schema下所有表 若写入dataSourceCode使用逻辑判断进行过滤，不使用sql条件过滤
//     * @param genTable 业务信息
//     * @return 数据库表集合
//     */
//    @Override
//    public List<GenTable> selectDbTableList(GenTable genTable)
//    {
//        List<GenTable> genList=new ArrayList<>();
//
//        StringBuilder genTableNames=new StringBuilder();
//
//        if(StringUtils.isEmpty(genTable.getDataSourceCode())){
//            List<GenTable> genMaster = genTableMapper.selectDbTableList(genTable).stream()
//                    .map(g->{
//                        g.setDataSourceCode("master");
//                        return g;
//                    }).collect(Collectors.toList());
//
//
//            if(CollectionUtils.isNotEmpty(genMaster)){
//                for(GenTable table:genMaster){
//                    genTableNames.append("'").append(table.getTableName()).append("',");
//                }
//                //处理主数据源配置表数据过滤，删除末尾字符
//                genTableNames.deleteCharAt(genTableNames.length()-1);
//                genTable.setGenTableNames(genTableNames.toString());
//                //保存主数据源配置
//                genList.addAll(genMaster);
//            }
//
//            List<SysSourceConfig> sysSourceConfigs = iSysSourceConfigService.selectSysSourceConfigList(new SysSourceConfig());
//            for(SysSourceConfig config:sysSourceConfigs){
//                DynamicDataSourceContextHolder.setDataSourceType(config.getSourceCode());
//                List<GenTable> sourceGenTables = genTableMapper.selectDbTableList(genTable).stream().map(g -> {
//                    g.setDataSourceCode(config.getSourceCode());
//                    return g;
//                }).collect(Collectors.toList());
//
//                genList.addAll(sourceGenTables);
//            }
//        }
//
//        DynamicDataSourceContextHolder.clearDataSourceType();
//        return genList;
//    }

    /**
     * 代码增强通过数据源进行数据过滤，默认不显示主数据源下表，通过条件查询显示
     * 查询schema下所有表 若写入dataSourceCode使用逻辑判断进行过滤，不使用sql条件过滤
     * @param genTable 业务信息
     * @return
     */
    @Override
    public List<GenTable> selectDbTableList(GenTable genTable)
    {
        List<GenTable> genList=new ArrayList<>();

        StringBuilder genTableNames=new StringBuilder();
        //数据源参数为空查询所有数据源
        if(StringUtils.isEmpty(genTable.getDataSourceCode())){
            //首先拿到主数据源下所有表
//            List<GenTable> genMaster = getDataSourceGenTables(genTable, "master");
//            if(CollectionUtils.isNotEmpty(genMaster)){
//                for(GenTable table:genMaster){
//                    genTableNames.append("'").append(table.getTableName()).append("',");
//                }
//                //处理主数据源配置表数据过滤，删除末尾字符 防止误操作造成其他数据和主库存在相同表
//                genTableNames.deleteCharAt(genTableNames.length()-1);
//                genTable.setGenTableNames(genTableNames.toString());
//                //保存主数据源配置
//                genList.addAll(genMaster);
//            }
            List<SysSourceConfig> sysSourceConfigs = iSysSourceConfigService.selectSysSourceConfigList(new SysSourceConfig());
            for(SysSourceConfig config:sysSourceConfigs){
                DynamicDataSourceContextHolder.setDataSourceType(config.getSourceCode());
                List<GenTable> sourceGenTables = getDataSourceGenTables(genTable, config.getSourceCode());

                genList.addAll(sourceGenTables);
            }
        }else {
            //查询数据源参数不为空，查询指定数据源
            DynamicDataSourceContextHolder.setDataSourceType(genTable.getDataSourceCode());
            List<GenTable> sourceGenTables = getDataSourceGenTables(genTable,genTable.getDataSourceCode());
            genList.addAll(sourceGenTables);
        }


        DynamicDataSourceContextHolder.clearDataSourceType();
        return genList;
    }

    /**
     * 查询数据源下 所有表
     * @param genTable
     * @param sourceCode
     * @return
     */
    private List<GenTable> getDataSourceGenTables(GenTable genTable, String sourceCode) {
        return genTableMapper.selectDbTableList(genTable).stream().map(g -> {
            g.setDataSourceCode(sourceCode);
            return g;
        }).collect(Collectors.toList());
    }


    /**
     * 查询据库列表
     *
     * @param tables 表名称组
     * @return 数据库表集合
     */
    @Override
    public List<GenTable> selectDbTableListByNames(List<ReqGenTable> tables)
    {


        Map<String,Set<String>> genTables=new HashMap<>();

        for(ReqGenTable reqGenTable: tables){
            Set<String> genTableSet=genTables.get(reqGenTable.getSourceCode());

            if(CollectionUtils.isNotEmpty(genTableSet)){
                genTableSet.add(reqGenTable.getTableName());
                genTables.put(reqGenTable.getSourceCode(),genTableSet);
            }else {
                genTableSet=new HashSet<>();
                genTableSet.add(reqGenTable.getTableName());
                genTables.put(reqGenTable.getSourceCode(),genTableSet);
            }
        }

        List<GenTable> genTableList=new ArrayList<>();

        for(String sourceCode:genTables.keySet()){
            DynamicDataSourceContextHolder.setDataSourceType(sourceCode);
            String[] tableNames = genTables.get(sourceCode).stream().toArray(n -> new String[n]);
            List<GenTable> sourceGenTables = genTableMapper.selectDbTableListByNames(tableNames);
            if(CollectionUtils.isNotEmpty(sourceGenTables)){
                sourceGenTables.stream().forEach(st->st.setDataSourceCode(sourceCode));
                genTableList.addAll(sourceGenTables);
            }
        }

        DynamicDataSourceContextHolder.clearDataSourceType();
        return genTableList;
    }

    /**
     * 修改业务
     *
     * @param genTable 业务信息
     * @return 结果
     */
    @Override
    @Transactional
    public void updateGenTable(GenTable genTable)
    {
        String options = JSON.toJSONString(genTable.getParams());
        genTable.setOptions(options);
        int row = genTableMapper.updateGenTable(genTable);
        if (row > 0)
        {
            for (GenTableColumn cenTableColumn : genTable.getColumns())
            {
                genTableColumnMapper.updateGenTableColumn(cenTableColumn);
            }
        }
    }

    /**
     * 删除业务对象
     *
     * @param tableIds 需要删除的数据ID
     * @return 结果
     */
    @Override
    @Transactional
    public void deleteGenTableByIds(Long[] tableIds)
    {
        genTableMapper.deleteGenTableByIds(tableIds);
        genTableColumnMapper.deleteGenTableColumnByIds(tableIds);
    }

    /**
     * 导入表结构
     *
     * @param tableList 导入表列表
     */
    @Override
    @Transactional
    public void importGenTable(List<GenTable> tableList)
    {
        String operName = SecurityUtils.getUsername();
        try
        {
            for (GenTable table : tableList)
            {

                String tableName = table.getTableName();
                GenUtils.initTable(table, operName);
                int row = genTableMapper.insertGenTable(table);
                if (row > 0)
                {
                    DynamicDataSourceContextHolder.setDataSourceType(table.getDataSourceCode());
                    // 保存列信息
                    List<GenTableColumn> genTableColumns = genTableColumnMapper.selectDbTableColumnsByName(tableName);
                    DynamicDataSourceContextHolder.clearDataSourceType();
                    for (GenTableColumn column : genTableColumns)
                    {
                        GenUtils.initColumnField(column, table);
                        genTableColumnMapper.insertGenTableColumn(column);
                    }
                }
            }
        }
        catch (Exception e)
        {
            throw new CustomException("导入失败：" + e.getMessage());
        }
    }

    /**
     * 预览代码
     *
     * @param tableId 表编号
     * @return 预览数据列表
     */
    @Override
    public Map<String, String> previewCode(Long tableId)
    {
        Map<String, String> dataMap = new LinkedHashMap<>();
        // 查询表信息
        GenTable table = genTableMapper.selectGenTableById(tableId);
        // 查询列信息
        List<GenTableColumn> columns = table.getColumns();
        setPkColumn(table, columns);
        VelocityInitializer.initVelocity();

        VelocityContext context = VelocityUtils.prepareContext(table);

        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList(table.getTplCategory());
        for (String template : templates)
        {
            // 渲染模板
            StringWriter sw = new StringWriter();
            Template tpl = Velocity.getTemplate(template, Constants.UTF8);
            tpl.merge(context, sw);
            dataMap.put(template, sw.toString());
        }
        return dataMap;
    }

    /**
     * 生成代码（下载方式）
     *
     * @param tableName 表名称
     * @return 数据
     */
    @Override
    public byte[] downloadCode(String tableName)
    {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ZipOutputStream zip = new ZipOutputStream(outputStream);
        generatorCode(tableName, zip);
        IOUtils.closeQuietly(zip);
        return outputStream.toByteArray();
    }

    /**
     * 生成代码（自定义路径）
     *
     * @param tableName 表名称
     */
    @Override
    public void generatorCode(String tableName)
    {
        // 查询表信息
        GenTable table = genTableMapper.selectGenTableByName(tableName);
        // 查询列信息
        List<GenTableColumn> columns = table.getColumns();
        setPkColumn(table, columns);

        VelocityInitializer.initVelocity();

        VelocityContext context = VelocityUtils.prepareContext(table);

        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList(table.getTplCategory());
        for (String template : templates)
        {
            if (!StringUtils.containsAny(template, "sql.vm", "api.js.vm", "index.vue.vm", "index-tree.vue.vm"))
            {
                // 渲染模板
                StringWriter sw = new StringWriter();
                Template tpl = Velocity.getTemplate(template, Constants.UTF8);
                tpl.merge(context, sw);
                try
                {
                    String path = getGenPath(table, template);
                    FileUtils.writeStringToFile(new File(path), sw.toString(), CharsetKit.UTF_8);
                }
                catch (IOException e)
                {
                    throw new CustomException("渲染模板失败，表名：" + table.getTableName());
                }
            }
        }
    }



    /**
     * 同步数据库
     *
     * @param genTable
     */
    @Override
    @Transactional
    public void synchDb(GenTable genTable)
    {


        GenTable table = genTableMapper.selectGenTableByName(genTable.getTableName());
        List<GenTableColumn> tableColumns = table.getColumns();
        List<String> tableColumnNames = tableColumns.stream().map(GenTableColumn::getColumnName).collect(Collectors.toList());

        DynamicDataSourceContextHolder.setDataSourceType(genTable.getDataSourceCode());
        List<GenTableColumn> dbTableColumns = genTableColumnMapper.selectDbTableColumnsByName(genTable.getTableName());
        List<String> dbTableColumnNames = dbTableColumns.stream().map(GenTableColumn::getColumnName).collect(Collectors.toList());
        DynamicDataSourceContextHolder.clearDataSourceType();

        dbTableColumns.forEach(column -> {
            if (!tableColumnNames.contains(column.getColumnName()))
            {
                GenUtils.initColumnField(column, table);
                genTableColumnMapper.insertGenTableColumn(column);
            }
        });

        List<GenTableColumn> delColumns = tableColumns.stream().filter(column -> !dbTableColumnNames.contains(column.getColumnName())).collect(Collectors.toList());
        if (StringUtils.isNotEmpty(delColumns))
        {
            genTableColumnMapper.deleteGenTableColumns(delColumns);
        }


    }

    /**
     * 批量生成代码（下载方式）
     *
     * @param tableNames 表数组
     * @return 数据
     */
    @Override
    public byte[] downloadCode(String[] tableNames)
    {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ZipOutputStream zip = new ZipOutputStream(outputStream);
        for (String tableName : tableNames)
        {
            generatorCode(tableName, zip);
        }
        IOUtils.closeQuietly(zip);
        return outputStream.toByteArray();
    }


    /**
     * 批量生产代码 多态 多数据源实现方式
     * @param tables
     * @return
     */
    @Override
    public byte[] downloadCode(List<GenTable> tables) {

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ZipOutputStream zip = new ZipOutputStream(outputStream);
        for (GenTable genTable : tables)
        {
            generatorCode(genTable, zip);
        }
        IOUtils.closeQuietly(zip);
        return outputStream.toByteArray();
    }


    /**
     * 查询表信息并生成代码
     */
    private void generatorCode(GenTable genTable, ZipOutputStream zip)
    {
        // 查询表信息

        List<GenTable> tables = genTableMapper.selectTablesList(genTable);

        if(CollectionUtils.isNotEmpty(tables)){
            if(tables.size()>1){
                throw new UtilException("检查代码生成配置，同一数据源下是否存在重复表！");
            }
        }else {
            throw new UtilException("检查代码生成配置，导入表不存在！");
        }
        GenTable table=tables.get(0);
        // 查询列信息
        List<GenTableColumn> columns = table.getColumns();
        setPkColumn(table, columns);

        VelocityInitializer.initVelocity();

        VelocityContext context = VelocityUtils.prepareContext(table);

        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList(table.getTplCategory());
        for (String template : templates)
        {
            // 渲染模板
            StringWriter sw = new StringWriter();
            Template tpl = Velocity.getTemplate(template, Constants.UTF8);
            tpl.merge(context, sw);
            try
            {
                // 添加到zip
                zip.putNextEntry(new ZipEntry(VelocityUtils.getFileName(template, table)));
                IOUtils.write(sw.toString(), zip, Constants.UTF8);
                IOUtils.closeQuietly(sw);
                zip.flush();
                zip.closeEntry();
            }
            catch (IOException e)
            {
                log.error("渲染模板失败，表名：" + table.getTableName(), e);
            }
        }
    }

    /**
     * 查询表信息并生成代码
     */
    private void generatorCode(String tableName, ZipOutputStream zip)
    {
        // 查询表信息
        GenTable table = genTableMapper.selectGenTableByName(tableName);
        // 查询列信息
        List<GenTableColumn> columns = table.getColumns();
        setPkColumn(table, columns);

        VelocityInitializer.initVelocity();

        VelocityContext context = VelocityUtils.prepareContext(table);

        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList(table.getTplCategory());
        for (String template : templates)
        {
            // 渲染模板
            StringWriter sw = new StringWriter();
            Template tpl = Velocity.getTemplate(template, Constants.UTF8);
            tpl.merge(context, sw);
            try
            {
                // 添加到zip
                zip.putNextEntry(new ZipEntry(VelocityUtils.getFileName(template, table)));
                IOUtils.write(sw.toString(), zip, Constants.UTF8);
                IOUtils.closeQuietly(sw);
                zip.flush();
                zip.closeEntry();
            }
            catch (IOException e)
            {
                log.error("渲染模板失败，表名：" + table.getTableName(), e);
            }
        }
    }

    /**
     * 修改保存参数校验
     *
     * @param genTable 业务信息
     */
    @Override
    public void validateEdit(GenTable genTable)
    {
        if (GenConstants.TPL_TREE.equals(genTable.getTplCategory()))
        {
            String options = JSON.toJSONString(genTable.getParams());
            JSONObject paramsObj = JSONObject.parseObject(options);
            if (StringUtils.isEmpty(paramsObj.getString(GenConstants.TREE_CODE)))
            {
                throw new CustomException("树编码字段不能为空");
            }
            else if (StringUtils.isEmpty(paramsObj.getString(GenConstants.TREE_PARENT_CODE)))
            {
                throw new CustomException("树父编码字段不能为空");
            }
            else if (StringUtils.isEmpty(paramsObj.getString(GenConstants.TREE_NAME)))
            {
                throw new CustomException("树名称字段不能为空");
            }
        }
    }

    /**
     * 设置主键列信息
     *
     * @param table 业务表信息
     * @param columns 业务字段列表
     */
    public void setPkColumn(GenTable table, List<GenTableColumn> columns)
    {
        for (GenTableColumn column : columns)
        {
            if (column.isPk())
            {
                table.setPkColumn(column);
                break;
            }
        }
        if (StringUtils.isNull(table.getPkColumn()))
        {
            table.setPkColumn(columns.get(0));
        }
    }

    /**
     * 设置代码生成其他选项值
     *
     * @param genTable 设置后的生成对象
     */
    public void setTableFromOptions(GenTable genTable)
    {
        JSONObject paramsObj = JSONObject.parseObject(genTable.getOptions());
        if (StringUtils.isNotNull(paramsObj))
        {
            String treeCode = paramsObj.getString(GenConstants.TREE_CODE);
            String treeParentCode = paramsObj.getString(GenConstants.TREE_PARENT_CODE);
            String treeName = paramsObj.getString(GenConstants.TREE_NAME);
            String parentMenuId = paramsObj.getString(GenConstants.PARENT_MENU_ID);
            String parentMenuName = paramsObj.getString(GenConstants.PARENT_MENU_NAME);

            genTable.setTreeCode(treeCode);
            genTable.setTreeParentCode(treeParentCode);
            genTable.setTreeName(treeName);
            genTable.setParentMenuId(parentMenuId);
            genTable.setParentMenuName(parentMenuName);
        }
    }

    /**
     * 获取代码生成地址
     *
     * @param table 业务表信息
     * @param template 模板文件路径
     * @return 生成地址
     */
    public static String getGenPath(GenTable table, String template)
    {
        String genPath = table.getGenPath();
        if (StringUtils.equals(genPath, "/"))
        {
            return System.getProperty("user.dir") + File.separator + "src" + File.separator + VelocityUtils.getFileName(template, table);
        }
        return genPath + File.separator + VelocityUtils.getFileName(template, table);
    }
}